Gravel or oe-e screen



N0 Model.) 2 Sheets-Sheet I P. J. HOYT. GYRAVBL OR ORE SCREEN.

No. 549,270. Patented NOV. 5, 1895.

2 Sheet s-Sheet N6 Model.)

P.J.HO YT.'. GRAVEL 0R OR-E SCREEN.

Patented Nov. 5

Inventor.

Witnesses:

Attorn ey PATENT OFFICE.

"UNITED STATES or (1110mm,-innmns.

, j GRAVEL ORO'RE SCREEN sPEcIFIc'ATIon forming part of Letters Jatent No. 549,270, dated November 5,1'89'5'."

'pi mm 518, January 22, 1896..

serihmssms is". (Remodel) separate disehm'ge-t'roughs t o be set-ht fan 'Toall whmw it may 001w n:

be it known thnt l, FREDERICK J; IloYT, n, "ineline,; sons to'betterfee'ilit ate the discharge 5 ;citizen of the UnitedStntes, residing at Ohiof theinaterialscreened by gi'avity,'m1' l' zils0 engo, in 'the county of Cook and State of Illito enable it to be carried at s ueh points and 5 noisphurveinvented certain new and useful distances from the pit will be most conven- .Improveinentsin Grnvelor Ore Sereens;land ient for separating the material into its di.,

I. do'hereby declare the following to be a full, ferent grndes'a nd loading iii into carts orears. clear, and exact deseriptionofrthe invention- At the front- :md top of the machine is such as will enable others skilled in the art to placed 2; hopper 13, or wh} is known as a lo {whiehit appertains to make and use the same. grizzly, it llaviiigf a eoiirse grzi e fo'rm of I My invention relates to gravel and ore screen I), on whichfi 13hr'own fche: lneiteriel. screens ,nnd its objects are to furnish a screen from thepit min-0mm ivhich'are thrown the with increased capacity for screening large bowlders and large Stones," '1he;san d,,a nd quantities of gravel, coal, ore, &e., and for gravela-r'e thenledirolnthe hopper-chute onto I 5 washing the same, if desired, and with great the filrsfisereen, which sand-semen C, a,

rapidityfbeyond theenpaeity of seree'ns'eoniproper and'eonveni 'fo'i vhieh would inonly employed fol-these purposes, to lessen be,one sixteentliof zin ineh. 'A hisfjis the 7 0 the expense "in 1he (:(mstruei-ion of suIeh.de sa'me i'orm of'sereen,:exeeptas toinesh, eSthe vices, and t) obviate the serious trouble of remaining ones of the series, it'will' n w be 2o clogging; which isnow eneountemd with man y described. xlt is shown best i'n Fig. 3 tt IidiSj forms of screens. composed of an endless belhoff wir'e. \Vire ,i

In the sereeningnnd washing'ofmixed'sand is preferred, zilthougihnlyi yentlioninprinand gravel, for instance, it is found desirable '(ri ple covers :1 e'en ofwzi'n iat'erizil'tlizi twill to make four separations of the saline, \"iz: {lilSh'CllhllO purpose. This belti inou ted 2 5 into sund,torpedo-gravel,roofing-gravel,and two sets ofrollers; cylinderspreferedien I paving-gravel. lly my invention I am 'enuppersetyupuanda lowerls et p 'ilheloiver abled to take this material from the pit in setofrollij-rs isplzieed l 'nriinnerlingle,shy, large quantities, nmke ihis separation of the of about ten degrees fro nth'e llIipOliSLS, so nmterizll, and wash and clear the same from ueu the upper rollers are set in ad\ 'a-nee,ofthe 0 all dirt by one handlin lower set, toaiforil room for plz'lein'gthelnekt Toihis end in yinvent-ion eonsistsoi' a screen lov screen new: to the first screen and to I and u series ofscreens and connect ions eoni'aeiliin teihefallingbygi'aYityof the material strueted and operated substantially in the f-roinolithe-uppersereenohffo'theloweronevor nnuiner hereinafter deseribed. ontonnyoth'erreeepteele;' Thisarrangement 35 "'lhe 'nppzu'utus lhm'e devised isi-llnstrated of the rollers permits and requiresi li eappliin its preferable form in the zu'eonl mirving cation of :1 longerundhenyier beltthzineould drm\'iny s, in whirhbe used with sets of rollers placed in it direct b Figure l is a side view in elevntion oi'n-severtical line, endthenvoiduneeof shhrp eor- -ries of thesereens l have invented, with their nersover which the screen is "turned fished,

4o eonneptions, arranged on a suitable frzuneby 'whiehihe strain and wearof sueh a heavy;

work; Fig.1 2, :i transverse View in elevation srreon u're mm-h reduced; but t-he'priheip'fi-l ou,lino .1: .r oi" l ie'. l; Finaa vi w inch-m uyhqmlngwrousisis in ii that in {he use of lion showing the opposiie" ide and reverse this longei'and he lei-s01 en, in'yonnee-tio 5] whet-lsmul sprocket-(4minwarryingiliehell'; sliouldnjbreuk or uptui'e iilie plueein. -ihe,

ll 4, :Minppluml' Fig. 3; Fig: 5, :wlbtiiilbifi hedyofthe' se'ree zi reni ,ilfolffihejsereen A I... roller::nuhsprmdeei wheeli and Fig. 1; u'di-fiztil" for repairisunnecessary,but u'l l thnt'js r 5,100 showing \\-uu-'|-- ipu quired to be done is'jto" loosen urebelt by the Referringloihvdmu ill-,IH, Ais u i'rmnewo'I-k adjusting device and repziirihe bi'euk; bythe 50 of timbers, whii-h is built up near the gmvelapplication of u new strip, 1f ihebelt is to pit (when it is desired to work the-apparatus be shortened thereby, suiiieient leewzry is af-u on. gravel) and of suliieient height and length fordedfor the purpose; and rem'ljustnient is to permit u series of my sermrns and their efieeted by moving the lower back roller.

This is a great advantage over those arrangements in which no such leeway is given. All these advantages are multiplied, of course, in the arrangement of the screens in series, as each set can be repaired, tightened, and adjusted independently of and without disturbing the others.

The screen is in width the length of the rollers. The length of the screen and its width may be of such dimensions as will best suit the character and amount .of the work to be performed and the location of the plant.

' only to support and carry the belt, but to obis, accomplished some cases and to clear, which the roller .of the cylinders. placed over and connects the-wheels on each side... For greater certainty and safety in keep the belt taut the wire tain another and most important result ,which mostly by the upper outer roller, of keeping the belt screen clean and does by its upward pressure against the under surface of the screen asthe latter passes over it. The lower set of rollers act chiefly as guides for the screen. These rollers are each provided with a shaft'a which has its bearings in'boxes a,

attached to the framework. The shaft of the back lower roller a is set in a movable box, I

which can be thrown back or forward by a screw a to tighten or loosen the belt. 0n the opposite 'end of each shaft is placed-a sp'rocket-wheeld of the same diameter as that A sprocketchain F is screen 1s sometimes attached along its sides to the sprocket-chain; but in many instances the chain and the spiocket-wheels may be dispensed with, as the screen can beset tomove' true onthe cylinders without them. i The top surface of the screen is inclined at an angle, say, of about ten degrees to facilitate the easyand quick travel and discharge of the material. k G is "a trough secured to one side of the frame and extending down at an incline between the upper and lower sections thereof and terminating in a spout, from which the material screened is discharged into a cart or car or upon the ground. Thetrough is provided with side pieces and is inclined tosuch a degree as will permit the screened material toiall readily from it. T9 the upper end or butt of this trough is placed a water-pipe H, composed of a vertical and a horizontal arm, the' latter being perforated. This pipe is connected with a pump or tank, by which ,such a supply of water is obtained as will dissolve and carry off the loam, clay, and dirt during the passage of the material screened to it's receptacle.

As shown in Fig. 1, a series of ,these screens is arranged to form an entire and complete lower set for adjusting apparatus when it is desired to separate the gravel or other material to be screened. In the case of screening gravel, for instance, the first screen, as already stated, is composed of a mesh of one-sixteenth of an inch for the first grade of sand and gravel, the second grade a one-eighth-inch mesh, and the third a three-eighth-inch mesh. In such an arrangement a pulley I is placed on the shaft of one of the cylinders of the lower screen part of the machine and another pulley l on a shaft of one of the cylinders of the upper machine, and a belt I is placed over these pulleys to connect the three machines. The shaft on which either of these pulleys is placed may be connected by belting with a main shaft driven by an engine.

' 'It will be seen that each screen and its supports constitute a separatejscreening apparatus, and that when used together the first is set higher than the one following, and so on in regular order, and all are set to give the screens an incline from one end to the other of the apparatus.

It is unnecessary to describe the length of belts, the angles of the diiferent inclines, and

the dimensions of the various parts, as these may all bevaried as experience and mechanical judgment may require.

What I claim is-- 1. An endless screen belt in combination with two sets of rollers, an upper and a lower set, on which said belt is mounted and over rollers set in which it travels, the said upper of said advance of the lower rollers, each the lower set of rollers movable on the frame work, and an adjusting device connected with said movable box, whereby-said box is rollers provided with shafts, boxes in which said shafts are mounted, one of said boxes on set forward or back to tighten or loosen said i belt, substantially as described.

, 2. 'In combination with a suitable supporting frame, a series of independent screens, each screen composed of an endless belt of wire work, each screen belt set at an incline,

and below and in advance of a preceding screen, and each of said screens successively differing from the other in mesh from a finer to a coarser grade, a discharge trough extending transversely through each screen, upper and lower sets of rollers on which said screens are mounted and carried, the upper set of said rollers set in advance of the lower set, an adjusting device connected with the the rollers forward or back, a pulley and band mechanism connecting said screens, and a suitable motor for driving the same, substantially as described.

Intestimony whereof I afiix my signature in presence of two witnesses. v

FRED. J. llOY'R' Witnesses:

WILLIAM II. IIoYr, SARAH M. Horr. 

